As shown in the figure, the performance of applying and distributing proxy credentials is strongly influenced by the amount of requests under the threshold of 50. However, when the number of requests is larger than 50, the influence is getting smaller. This could be caused by the network condition, while the request message as well as the distribution message are transmitted much more frequently, if there is a lot of requests for proxy credentials. Therefore, the configuration of the threshold for the maximal amount of application requests should be configured to a suitable value. If it is too small, the efficiency of the security framework is limited.